Malicious PDF — malware analysis report

Static analysis result for SHA-256 74116af512eb1576…

MALICIOUS

PDF

89.3 KB Created: 2021-04-24 17:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0faec0402b77f1a1e697312528d14a83 SHA-1: 363870b8af348987ae1ecefb677f2f6a3c3d100e SHA-256: 74116af512eb15764bcd32fea1f83fdd2bfc2ddac1049a413ee36e15911e62b4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to disposable domains or are used in a link farm configuration, indicating a phishing or SEO spam attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=what+is+your+favourite+leisure+time+activity PDF link annotation
    • http://rejemezurufoveg.mywebcommunity.org/5469329239.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/iHhaahh/game_maker_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/3MqgtWf/minecraft_cute_boy_skins_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410432/normal_5ff0b51d58cec.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/Iheidgh/wosigozuw.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/nelson_mandela_long_walk_to_freedom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_6017f7f2ce27c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_600468d8d0ca1.pdfIn PDF document text
    • https://cdn.sqhk.co/jusulikipe/jheehec/thomas_mcinerney_yahoo.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/EAgjqib/82315829246.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/desigarifivalot.pdfIn PDF document text
    • https://cdn.sqhk.co/tulazofava/hgr3Zja/totopos_dallas_ga_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_1c1f2e96c53f4c4587d311e39874014a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e71676e-712f-4593-805d-583c6bd9b8ce/filosofia_del_derecho_hegel_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2417813-9111-47c4-960e-f26b4dd301a6/74130162146.pdfIn PDF document text
    • https://eda15335-3b41-4752-a6ea-ca28a3d9ec24.filesusr.com/ugd/db55a9_cfbbe179337248a48b3f509a1c1ba164.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e7d0d7-7089-42bc-8c51-9f26c344b4b9/how_to_run_a_food_business_from_home.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/saguralatipewavepuzo.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_a7e00fc7f09b47ff8adfc79e5f0cf948.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af50c7c-e105-4a00-b59d-e5fbeb27eb01/stock_market_books_indian_authors.pdfIn PDF document text
    • https://b7953657-6b45-4ea9-9d9d-f701e3f26526.filesusr.com/ugd/45996c_a476bcef7b964555aa0fd2fa3f5f559f.pdf?index=trueIn PDF document text
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_00bba8dc81d34c599cbe3d57c5813042.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/632f9c64-4af8-4aea-8aa0-3f3bd7d1b975/what_does_steak_tartare_taste.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 5072 bytes
SHA-256: 9753a225803102c4471b66bd02a4701f6d045eb5c50594b604c72f5bd01c2cfd
font_01_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 11228 bytes
SHA-256: 8df24120838b87bcec98b9e995f8e951314105103814cb99a130ad94219f4f65
font_02_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 16632 bytes
SHA-256: a0f721931e8d46909a5774dfc5fef3f121ae0007caac5936856919a4d872074d
font_03_sfnt_off000148f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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